It's normally cheaper to use a 3rd party company like Wise or Dee money to transfer between bank accounts. A wire transfer costs money on both ends and normally the exchange rate the bank gives you is subpar to Wise.
Whoever told you that is an idiot. Thai language schools aren't the only forms of studying eligible for ED visas. Plenty of people come to study at Thai universities and get ED visas for the duration of their 4-6 years of studying.
Non university route, Muy Thai, kick boxing, self defense schools can issue ED visas, legitimate programs have 1 year ED visas, not the 90 day that has to be extended.